<!DOCTYPE html>
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<html>
    <head>
        <title>TODO supply a title</title>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
             <script language="javascript" type="text/javascript" src="observa.js">
            
        </script>
    </head>
    <body>
        <div>TODO write content</div>
     
        <button id="addNewObserver">Add New Observer checkbox</button>
        <input id="mainCheckbox" type="checkbox"/>
        <div id="observersContainer"></div>
        <input type="button" value="Ejecutar función" id="mi_boton" />
    </body>
</html>
